Grate-bar.



` citizen oi" the United States,

ALFRED WiLhl'NilN, 0F BRTDGEJPRI, PENNSYLVANIA, ASSIGNR T CUMPANY, INCURPORATED, l?

. ne. arnese.

Specification of Letters Patent.

Patented April a, ieee.4

Applieetiou filed April 29, 1905. Serial No. 258,050:

To all whom entity concern:

`Be it known that I, ALFRED WILKINsoN, a and a resident of Bridgeport, Pennsylvania, have invented certain improvements in Gratears, oi which the following is a speciiication.

` My invention consists of certain improve niente in gra'tediarsoi the character shown in my previous Letters Patent, 'iN os. 480,538, 541,405, and 541,448, the objects oi my present invention being to provideA for the ednvenient formation of air-holes and twyeropenings in the fuel-supporting surface of the grate and to provide for `the ready renewal of any defective portion of a grate-bar without necessitating renewal of other portions ot alle saine. These objects l. attain inthenianner hereinafter set forth, reference being had to the accompanying drawings, in which- Figure 'l is a erspectivc View oi a gratebar constructed in accordance with my resent invention. Fig. Zie a longitudinallheetion of the saine. gitudinal section of part of the bar. Fig. 4 is au enlarged perspective View of one oi: the

units ei the iuel-supporting surface of the bar. Fig. 1s a side View of the saine on a still larger scale. Fig. 6 is a transvelse section on the line o a, Fig. 3; and Fig,... 7 is a sectional plan View, on an enlarged scale, on the line b I), Fig. 3.

The grate-bar has" a stepped fuel-supporting surface, as in the bars previously einployed in 1ny"autoniatie Stoker, this stepped surface having twyer-o )enings in the risers oi'l the steps and the bar'also having in the presentinstance air-holes in what may be termed the treads t of 'the steps-#that is to say, the

portions upon Ywhich Vthe bed olE fuel rests. Each ofthe steps is also in the present bar an independent unit'applieable to and removable .from thetop of thebar. The'grate-bar consists of a hollow trough-'likebod y portion l., open at the top, and a perforated fuel-support ing` portion mounted upon and extending across said open top ofthe body portion. The trougl1-like body ortion is open at the top, the upper edges ci? the opposite side walls of the saine presenting an inclined plane 2, and each of said walls having on its inner face a horizontal groove or recess 3, extending out to Fig, 3 is an enlarged londisplacement of the inclined upper edge oir' said sidewall, as shown in Fig. 3. The fr1el;-nipport1nil portion of the bar iseoznposed of a pluraiity oi twyer-,plates 4, each with a number oi perfobar when the upper face of theftwyer-plate 4' occupies a horizontal position, as -shown in. Fig. 2. The rear portion of each twyer )lute 4 is contracted in. Width, as shown in Fig. 7, so that it may tit between the opposite side walls of the body portion of the grate-bar and may enter the recesses or grooves 3 formed therein, the rear edge of the twyer-plate be ing notched, as at 10, Figs. 4 and 7, so as not to interfere with the free access oi the air to a twyer-plate above the saine. The depending front iiang'e 6 ofeaeh twyer-plate rests upon the' upper iace of the twyer-plate below it, and in order to prevent horizontal dislodgment of," one twyer plate in respect to the other each twyenplate has projecting from its upper face at each edge a ing' upon the depending foliowing plate, the rear faces or' the lugs loe-- ing,l undercut, as shown inAFig. 5, so as to overlap the beveled front of the ilange (i and aise revent vertical displacement of the saine. iurther provision against horizontal each twyerlate is afforded by lugs 12 on the under sidle of each plate, which lugs enter notches 13 in the bases oi" the grooves' 3. When agrate bar thus equipped has air under pressure forced into the saine, said air escapes into the mass et fuel both from the twyer-openings 5 inthe horizontal portions oi the plates and also from the twyer-notches 7 in the `liront ilanges oi the saine. Hence an ample supply of air for maintaining combustion el the fuel is in sured.

The lowerinost twyer-plate 4 is locked in place by means of a nut on a hooked bolt 15, which engages a lu at the-bottoni of' the body `ort-ion of the ghar, and this serves also to loc the other plates in place when the bar is in use. When this plate has been removed,

lug 11 for bean. front flange of the' however, the twyer-plates above the same can also be readily removed by simply raising the forward edge of a plate until its lugs 12 are free from engagement with the notches 13, the plate being then drawn outwardly, and anew plate can be readily inserted by a reversal of these operations, so that any burned, worn, or otherwise defective part of the fuel-supporting surface of the bar can be readily renewed without necessitating the renewal of any other part of said surface.

The upper portion of the trough-shaped body portion of the bar is stifiened and strengthened by means of transverse bracerods 16, east with the bar. (See Fig. 2.)

Either the perforations 5 or the notches 7 may be omitted, if desired, but the use of both is preferred.

Having thus described my invention, I claim and desire to secure by Letters Patentl. A grate-bar comprising a trough-shaped body portion open at the top and a fuel-supporting portion consisting of a series of perforated twyer-plates independently mounted upon said body portion of the bar so as to overlap, and extending across the open top of said body portion, each plate being prevented from moving either longitudinally or transversely in a horizontal plane by engagement with the sides of the body portion of the bar, substantially as specified.

2. Agrate-bar comprising a trough-shaped body portion open at the top, and a fuel-supporting portion consisting of a series or' perforated twyer-plates independently mounted upon said body portion of' the bar so as to overla i, and extending across the open top oi said body portion, each plate, except the lowermost, being locked in position against horizontal displacement by engagement with the plate below and also by engagement of a portion of it with the sides of the body portion of the bar, substantially as specified.

3, Agrate-bar comprising a trough-shaped body portion open at the top, and a fuel-supporting portion consisting oi a series of perorated twyer-plates independently mounted upon said body portion of the bar so to overlap, and extending across the open top of said body portion, each plate, except the uppermost, being locked in position against vertical displacement by engagement with the plate above and also by engagement with the sides of the body portion of the bar, substantially as specified.

4. Agrate-bar comprising a trough-shaped body portion open at the top, and a fuel-supporting portion consisting of a series of perforated twyer-plates independently mounted upon said body portion of the bar so as to overlap, and extending across the open top of said body portion, each plate, except the lowermost, being locked in position against vertical displacement by engagement with the plate below, and also by engagement with the sides of the -body portion of the bar, sub-- stantially as specified.

5. A grate-bar comprising a trough-shaped body portion open at the top, and a fuel-supporting portion consisting of a series of periorateA twyer-plates independently mounted upon said body portion of the bar so as to overlap, and extending across the open top of said body portion, each plate, except those at the ends of the series, being locked in poisition against vertical displacement by engagement with the plates above and below it, and also by engagement with the sides of the body portion of the bar, substantially as specified.

6. Agrate-bar comprising a trough-shaped body portion open at the top, and a fuel-supporting portion consisting of a series of perforated twyer-plates independently mounted upon said body portion of the bar so as to overla and extending across the open top of sai body portion, each plate, except the lowermost, having a front flange resting u on the top of the twyer-plate below and the atter having lugs for engaging said flange, substantially as specified.

- 7. A grate-bar comprising a trough-shaped body portion open at the top, and a fuel-supporting portion consisting of a series of perforated twyer-plates independently mounted upon said body portion oi the bar so as to overlap, and extending across the open top of said body portion, each twyer-plate, eX- ceptthe lowermost, having a front ange resting upon the top of the twyer-plate below, and the latter plate having lugs for engaging said flange and being also provided with means for locking it to the sides of the body portion, of the bar against horizontal displacement, substantially as specified.

8. Agrate-bar comprising a trough-shaped body portion open at the top, and having side walls with inclined tops and grooves in the inner faces of said side walls extending rearwardly from the inclined tops, and a Juelsupporting portion consisting of a plurality of twyer-plates, each extending across the open top of the body portion oi the bar-and engaging certain of said grooves, and each having side flanges with bevcledrlower edges resting upon thev inclined tops of the side walls, substantially as specified.

9. A grate-bar comprising a trough-shaped body portion open at the top and having side walls with grooves in the inner faces said grooves havingnotched bottoms, and a fuelsupporting portion consisting of a plurality of twyer-plates extending across the top of the body portion of the bar, and each engaging the notched bottoms of certain of said grooves, substantially as specified.

1U. A grate-bar comprising a troughshaped body portion open at the top and having side walls with grooves in their inner ICO IIC

IIE

faces, and a fuel-su porting ortion eonsist- In testimony whereof l have signed my ing of a plurality oi) twyer-p etes extending name to this speciieationin the presence of lo across the open top ofthe body portion ofthe two subscribing witnesses.

bar, and eaeh havin a front portion with 5 flanges resting upon t 1e tops ofthe side walls ALFRED WILIHNSON and a, rear portlon of contracted Width e11- Witnesses: ga Jfing with grooves in the inner faces of said WM. BROWN, Jr.,

Wa ls, substantially as specified. WM. E. SHUPF.. 

